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Illness through food contamination by Escherichia coli O157:H7(E.coli O157:H7)happened frequently in recent years.Agricultural products may get infected with E.coli O157:H7 during growth.Therefore,understanding the source and distribution of E.coli O157: H7 in agricultural products can help prevent the infection of products.This paper summarized the possible sources and general distribution of E.coli O157: H7 in agricultural products.